At oil and filter change I will add 9 qts. of oil. After first engine run that will show at about 8.5 on the dip stick. Fly the airplane until the oil dip stick shows 7.5-8 and then add a quart. (typically 10-15 hrs.) Anything over 9 qts. on the dip stick is too much and will get blow out the breather and show up as on the belly.
I believe the book says the engine will run safely down to something close to 4 qts. but I would not test that....

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I asked my engine builder years ago, his response- let the oil go down until it stops losing oil. 6qts is were it stops and loses very little below that mark. I have added more (7qts) on new changes and it keeps the same temps and throws it out most oil quickly than stabilizes at 6.
My temps are 200F +/- 10F at 6 qts in warmer climates

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